Non-intrusive characterization of the redox potential of landfill leachate plumes from self-potential data

Arora, Tanvi; Linde, Niklas; Revil, A.; Castermant, Julien

doi:10.1016/j.jconhyd.2007.01.018

Cited by 87 publications

(114 citation statements)

References 33 publications

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“…Recently, a similar battery model was proposed by Arora et al (2007) and for organic-rich contaminant plumes in which a sequence of redox reactions occur and biotic electron nanowires, existing between bacteria in a biofilm, may be involved in the process and, therefore, the redox reactions decouple over space. The difference between the abiotic and biotic models of geobatteries is that in the biotic model, there are no potential losses because the bacterial biofilms play the role of catalysts in the transfer of electrons between electron donors and electron acceptors (Revil et al 2010a).…”

Section: Short Historymentioning

confidence: 99%

Review: Some low-frequency electrical methods for subsurface characterization and monitoring in hydrogeology

et al. 2012

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Low-frequency geoelectrical methods include mainly self-potential, resistivity, and induced polarization techniques, which have potential in many environmental and hydrogeological applications. They provide complementary information to each other and to in-situ measurements. The self-potential method is a passive measurement of the electrical response associated with the in-situ generation of electrical current due to the flow of pore water in porous media, a salinity gradient, and/or the concentration of redoxactive species. Under some conditions, this method can be used to visualize groundwater flow, to determine permeability, and to detect preferential flow paths. Electrical resistivity is dependent on the water content, the temperature, the salinity of the pore water, and the clay content and mineralogy. Time-lapse resistivity can be used to assess the permeability and dispersivity distributions and to monitor contaminant plumes. Induced polarization characterizes the ability of rocks to reversibly store electrical energy. It can be used to image permeability and to monitor chemistry of the pore water-minerals interface. These geophysical methods, reviewed in this paper, should always be used in concert with additional in-situ measurements (e.g. in-situ pumping tests, chemical measurements of the pore water), for instance through joint inversion schemes, which is an area of fertile on-going research.

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Section: Short Historymentioning

confidence: 99%

Review: Some low-frequency electrical methods for subsurface characterization and monitoring in hydrogeology

et al. 2012

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“…These two equations can be combined for any electrical conductivity distribution and boundary conditions to solve for the distribution of ϕ given knowledge of j S . The total source current density for the three dominating SP sources in hydrological applications can be described by Arora et al, 2007) …”

Section: Governing Sp Equationsmentioning

confidence: 99%

Self-potential investigations of a gravel bar in a restored river corridor

Linde

Doetsch

Jougnot

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Self-potentials (SP) are sensitive to water fluxes and concentration gradients in both saturated and unsaturated geological media, but quantitative interpretations of SP field data may often be hindered by the superposition of different source contributions and time-varying electrode potentials. Self-potential mapping and close to two months of SP monitoring on a gravel bar were performed to investigate the origins of SP signals at a restored river section of the Thur River in northeastern Switzerland. The SP mapping and subsequent inversion of the data indicate that the SP sources are mainly located in the upper few meters in regions of soil cover rather than bare gravel. Wavelet analyses of the timeseries indicate a strong, but non-linear influence of water table and water content variations, as well as rainfall intensity on the recorded SP signals. Modeling of the SP response with respect to an increase in the water table elevation and precipitation indicate that the distribution of soil properties in the vadose zone has a very strong influence. We conclude that the observed SP responses on the gravel bar are more complicated than previously proposed semi-empiric relationships between SP signals and hydraulic head or the thickness of the vadose zone. We suggest that future SP monitoring in restored river corridors should either focus on quantifying vadose zone processes by installing vertical profiles of closely spaced SP electrodes or by installing the electrodes within the river to avoid signals arising from vadose zone processes and time-varying electrochemical conditions in the vicinity of the electrodes.Correspondence to: N. Linde

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“…This relationship is based upon a model of the source located close to the water table with a C H value of 0.5 shown to represent a vertical dipole geometry created by a shallow organic contaminant plume Arora et al 2007). The geometry of the coupling coefficient is related to the solid angle of the source in relation to the observation electrodes which varies from C H 0.5 in field studies as stated above to 0.18 to 0.2 in 2D laboratory studies ).…”

Section: Introductionmentioning

confidence: 99%

Microbial ecology and geoelectric responses across a groundwater plume

et al. 2015

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We use geophysics, microbiology and geochemistry to link large scale (30+m) geophysical selfpotential responses at a groundwater contaminant plume with its chemistry and microbial ecology of groundwater and soil from in and around it. We show that microbially mediated transformation of ammonia to nitrite, nitrate and nitrogen gas is likely to have promoted a welldefined electrochemical gradient at the edge of the plume which dominates the self-potential response. Phylogenetic analysis demonstrates that the plume fringe or anode of the geobattery is dominated by electrogens and biodegradative micro-organisms including Proteobacteria alongside Geobacteraceae, Desulfobulbaceaese and Nitrosomonadaceae. The uncultivated Candidate Phylum OD1 dominated uncontaminated areas of the site. We define the redox boundary at the plume edge, using calculated and observed electrical self-potential (SP) geophysical measurements. Conductive soils and waste act as an electronic conductor, which is dominated by abiotic iron cycling processes that sequester electrons generated at the plume fringe. We suggest that such geo-electrical phenomena can act as indicators of natural attenuation processes that control groundwater plumes. Further work is required to monitor electron transfer across the geo-electrical dipole to fully define this phenomenon as a geobattery.This approach can be used as a novel way of monitoring microbial activity around the degradation of contaminated groundwater plumes or to monitor in situ bioelectrical systems designed to manage groundwater plumes.

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Non-intrusive characterization of the redox potential of landfill leachate plumes from self-potential data

Cited by 87 publications

References 33 publications

Review: Some low-frequency electrical methods for subsurface characterization and monitoring in hydrogeology

Review: Some low-frequency electrical methods for subsurface characterization and monitoring in hydrogeology

Self-potential investigations of a gravel bar in a restored river corridor

Microbial ecology and geoelectric responses across a groundwater plume

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